Characteristics and Applications of Brushes Used in Power Finishing
Operating Speed Range, sfpm
Brush Type
Description
Uses
Remarks
Radial, short trim dense wire fill
6500
Removal of burrs from gear teeth and sprockets. Produces blends and radii at juncture of intersecting surfaces. For cleaning welds in the automotive and pipeline industries. Also for cleaning surfaces prior to painting, stripping rubber flash from molded products and cleaning mesh-wire conveyor belts. Serves as utility tool on bench grinder for removing feather grinding burrs, machining burrs, and for cleaning and producing a satin or matte finish. For producing radii and improving surface finish. Removes the sharp peaks that fixed abrasives leave on a surface so that surface will accept a uniform plating. Polishing marks and draw marks can be successfully blended. For cleaning steel. Used in electrolytic tinplate lines, continuous galvanizing and annealing lines, and cold reduction lines. Used to produce dull or matte-type finishes on stainless steel and synthetics.
Brush should be set up so as to brush across any edge. Reversal of rotation needed to maintain maximum cutting efficiency of brush points. Surface speed plays an important role since at low speeds the brush is very flexible and at high speeds it is extremely hard and fast cutting. Good for hand held parts as brush is soft enough to conform to irregular surfaces and hard-to-reach areas. Smaller diameter brushes are not recommended for high-production operations. Brush is selective to an edge which means that it removes metal from an edge but not from adjoining surfaces. It will produce a very uniform radius without peening or rolling any secondary metal. Speeds above 3600 sfpm will not appreciably improve operation as brush wear will be excessive. Avoid excessive pressures. Ammeters should be installed in drive-motor circuit to indicate brushing pressure.
Develops very little impact action but maximum cutting action. Normally used singly and on portable tools. Brush is versatile and provides high impact action. With the 4- to 8-inch diameter brush, part is hand held. With the 10- to 15-inch diameter brush, part is held by machine. Provides means for improving finish or improving surface for plating. Works best with grease base deburring or buffing compound. Can be used with flow-through mounting which facilitates feeding of cold water and hot alkaline solutions through brush face to prevent buildup.
Radial, medium to long trim twisted knot wire fill
7500-9500 for high speeds. 1200 for slow speeds.
4500-6000
Radial, medium to long trim crimped wire fill
Radial, sectional, non-metallic fill (treated and
5500-6500 7500 for polishing
untreated Tampico or cord)
Radial, wide-face, nonmetallic fill (natural fibers or synthetics)
750-1200 for cleaning steel. 600 when used with slurries
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